Improved extension-trestle



nam: emo;

-OTTO SLlIK ER, OF LINCO'LNyILLLINOIS.

Letters ,Patent No. 91,979, dated .Time- 29, 1869.

IMPROVED EXTENSION-TRESTLE.

The Scheule refen'ed to in these Letters Patent :md making part of the same.

To all u'liom 'it 'ma-y cmlce'rn:

Be it known that I, OTTO SLIKER, of Lincoln, in the county of Logan, and State of Illinois, have invented a new and useful lmprovement in Extensioni Trestles and I do hereby (leclare the following to be a full and correct description of the sa-me, snfficient to enable othersskilled in the art to which my invention relates, to fully understand and use the same, reference being had to the accompanying drawings, which make part of this specification, and in which-'- Figure 1 is a perspective view, and

Figure 2, is a section in line x x, fig. 1.

Like letters of reference indicate like parts in both fignres.

rllhe nature of my invention consists in providing the upper end of the stationary standards, or legs of the trestle, with a sheave, over which a rope passes, this rope being attached to the 'foot of the sliding legs, and operating in a groove in the inner face of the same. Also, in the manner of attaching Vthe legs, or 'standards to the cross-beams, and of steadying the whole apparatus. p

A A', in the drawings, may represent the lower or stationary legs of the trestle, provided at 'their top. with hands, ay a', which grasp the movable, or sllding legs B B', and being grasped themselves by hands, b b', attached to the lower ends of the Iegs B B'.

O C' are the cross-beams, being provided, at opposite ends, with hands, c'c', grasping each other's free ends. These cross-beams are connected, O to the legs B, and O' to the legs B', by means of screw-bolts d d', two'bolts on each end passing through the legs and cross-beams in opposite directions, being secuned by thumb-nuts, e e', so that by unscrewing the-latter, the trestle can be quickly taken to pices, packed into a small compass,itransported to any desired place, and then erected in a very few moments.`

, In the top of the legs A A', I provide sheaves, f f', over which ropes, g g', pass inwardly, down' a groove, h, in the legs B B', and through the lower end of the latter legs, to which they may be secured by a knot, as shown in the drawings, or in any other suitable manner-V By pulling these ropes g g', the'legs B B' are elevated, as will be easily understood. i

On the inner faces of the legs A A" are provided lngs, or ears 'i 73', between which flat bars, k k', are pivoted, said' bars having pins, l l', at theirends, and being provided with holes m m', in such a manner that when the bars are placed parallel to each other, the pin ot' each bar will seize 'in a correspondlng hole in the contig'uons bar, and thns hold and steady the trestle at whatever distance the lower legs A A' may be apart.

Having thus described my invention,

hat I c'laim as new, and desire to secure by Letters Patent, is-

The combination and arrangement, in an extensiontrestle, of sliding legs A A', B B', sliding cross-beams O 0', screw-bolts d d', thumb-nuts c e', bands'a a', b b', c c', sheaves f', ropes g g', slots h, ears 'i 11', bars k k', pins l l', and holes m 'm', all arlanged and Operating as described and shown.

OTTO SLIKER. Witncsses:

JosEPH Oovme'ron, Crms. H. MILLER. 

